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Supplemental Guarantor Information (Narrative) (Details)
12 Months Ended
Dec. 31, 2019
Senior Notes Due 2025 [Member]  
Debt Instrument [Line Items]  
Interest rate 5.875%
Maturity year 2025
Senior Notes Due 2027 [Member]  
Debt Instrument [Line Items]  
Interest rate 6.75%
Maturity year 2027
Senior Notes Due 2022 [Member]  
Debt Instrument [Line Items]  
Interest rate 6.875%
Maturity year 2022